Set partly in America, which Dickens had visited in 1842, the novel includes a searing satire on the United States. Martin Chuzzlewit is the story of two Chuzzlewits, Martin and Jonas, who have inherited the characteristic Chuzzlewit selfishness. It contrasts their diverse fates of moral redemption and worldly success for one, with increasingly desperate crime for the other. This powerful black comedy involves hypocrisy, greed and blackmail, as well as the most famous of Dickens's grotesques, Mrs Gamp. In her introduction to this new Penguin Classics edition, Patricia Ingham discusses how, in writing a story that was only meant to 'recommend goodness and innocence', Dickens succeeded in exploring 'the intertwining of moral sensibility and brutality.'

As for many of Dickens' novels, highlighting social injustices is at the heart of Little Dorrit. His father was imprisoned for debt, and Dickens' shines a spotlight on the fate of many who are unable to repay a debt when the ability to seek work is denied. Amy Dorrit is the youngest daughter of a man imprisoned for debt and is working as a seamstress for Mrs Clennam when Arthur Clennam crosses her path. Will the sweet natured Amy win Arthur's heart? And will they ever escape the shadow of debtors' prison?